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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027613026f426966946bdd1d51c2fc19fe236cb1660b9d495c8d26366349f118' 
  AND token = '67jLgO85IW1Tzs7sGltuRsrj2+8Q5ddH3H8TFi4ZuZY=' 
  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"
    }
  }
}