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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a2dc2720934290eb71ee7a060278a4f177e55b8b0a67b1c2c316db517c80e5' 
  AND token = '6Vu0bPW+BV3mj2GiAZ2U3y1n3jsQjYaGk01hd0fQVWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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