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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde6006e0570b241d7a0f7353b2074e2743577882b6eb4afaa780914ab8d54bd' 
  AND token = 'cVBCG6NI8PwkJpi3klDe0KeMhIx+YfGixLfO6ycAWpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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