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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b66db42e08380670bac011a381f93403200ba591aeb6ad64c47174ed0bcc6a' 
  AND token = 'U79PYvjO5uYKO7SMRfhE4Gbbfml0HZdjQeRldS1G9s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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