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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de934013fd6040b8e5777c61e59b76745f64fbf470a351e2b3b57d832b6e4216' 
  AND token = '5OVkqbCiZ7kA97YsIIwnbVOnEtv4d6nnAbKnDHtUEdk=' 
  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"
    }
  }
}