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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d73e61485810e105fc68a0ffa8c6d83b8a6ee85f661577f73be76c98b0ba9d' 
  AND token = 'PGFtIcJoExaIjsT1wOTXTgcg3OQXE4CMm3oyFVU1sCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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