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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50abb1686aebd34a3c08059a6603d178ec0aee0a413ec9040f037e29e808bd42' 
  AND token = 'k5+ghSAhdejaA2iG/zN5ITtnVtfa5X9+zY2YdMcjxyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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