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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b74862fabc33b3ee67dff476ca7aa5500ee372a296a9dad2767225002cac29' 
  AND token = 'IF7UNM6O/Do06Y7FYT83/3I4irsyNszkh7e3FEuW6CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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