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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76f3943c685f1054322a0506646f4d2449feeccedd68b07bd61dc7c6e0d2cb1' 
  AND token = 'wwXkdhKEhm9HGeuwVUIBEk0aYrnMWu+aWM+l6ierhYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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