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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e97a7f6a369b65d8b6419cb5a83b5b12af090db95334f78390d68086cb7dd9' 
  AND token = 'oKYf4TFSv99IOqFmkI3a1dhC0Diktua05JxdBLZJb6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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