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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece9e920980c4c2fb6a5ce834178fba6acfc9b68fc7db34911b02eace8053c58' 
  AND token = 'iEvfukGE+qekTECTqR5hFzTajka59rjBUp1ZpD5cNWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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