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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3822352eaec1a0e926b4804acd7b14f6c4e143c80d0e939f1869d55fa415170' 
  AND token = 'yYMq6MGNIOCYgxbcUfDv18b5tunfAO8lIvlVWfO0nk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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