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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d5fad6a4ca42d9576826fc12fc8d6e9b8ddab3deadda9df12e87b2aa0d93be' 
  AND token = 'G9NFEqz9y6tFC1iCn0a0QHwOEAKkPG71ymJEc14tFws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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