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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd983ad1a91261b5c288f28693ac80d1067c66c0cb9a14f525264b7f5a49feabe' 
  AND token = 'FYiGLqLwk5fZS8XZlabGtPUB52TesMg1/68jOZ4slFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}