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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1940e2095a1b7a157186d9c88787a8843f73b3f3be2ec011d60ccc6398e5ff3f' 
  AND token = '74OQq2ZBUoPKaJFtP4MrOrDj4Tjq6tO7sck5/ZEOKKM=' 
  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"
    }
  }
}