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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40954d277abaefb94d305dcc12d480c5690656bc6e71d110c94bbc1f0afce10' 
  AND token = 'n9sXyOrw8GoFjE/AeYi69D8PQam1UY+y5occ0PfSTuU=' 
  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"
    }
  }
}