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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9df558db24dbd9ec5b086cda940ad4fa0a3d87598c091a2cc0b7b678e04497f' 
  AND token = 'LwDBziunmEsdVFUZr14+9k1L4PA8xwegV4r9d+VLmZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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