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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f776f0384e6da2fc529e5b952f7d8359661f8ac5a7f0db63b04d28c307c701e1' 
  AND token = 'wAeyh6AtMHMJ7OOr8WGlre/0NECPd7mm3iBiihHJUcQ=' 
  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"
    }
  }
}