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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f344638caa67d9a9f36ebef4a09cd9b2685b21139cb04d2b4a910a367977700' 
  AND token = 'WNUpzcyh7ic8fs8DF66Ru3tRn3C4KOGCt0u7A6yFHEk=' 
  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"
    }
  }
}