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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20aca684b84d3342d0bb728181c90ffd6d689c458b720f26e6d78c16723339f' 
  AND token = 'cn8JWSDfyA07Fumz/x+KgFtd1gwr/mN0q82T+5I+z9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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