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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264ddb8d846faa442d156f02528a089211ba275201a8a510196ed634d311e400' 
  AND token = 'KvRIoqzJZMvY42Sz+Cpuf7sSq29MFQ05k6A8keR2pbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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