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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036fc431d4ae37849a71c14cbe5c6f98f37c382a3d6584aa09aa71a6e084be15' 
  AND token = '5R4GEwEZGtZXQ7YvybJBfVyuivA8C7f8xuBhJFEcHRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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