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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbebdc24af05eb1bb232ff8bbb4d8875a2b3b011480e65a30a0c067039e8317d' 
  AND token = 'tcj+Extq73AegPd7RA4hAJEPm1qcJzyMkPcMlrkMm+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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