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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639e3d55f7fd72182ca3c9fcb5c2df1d250ea9691115595cdd36dade01c728fd' 
  AND token = 'G4QpzIiHobiwJSU6bHL+B3jEHmh9kaF5eP2IZ0txZeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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