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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9933c47556aa217a046b6e56e0c28585b82276ec506d67c1962d103632893f' 
  AND token = 'P1/CRAqgtKVkg1q5ck1Q/Mc5BQumEF9xLPEknT285Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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