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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c39b5ad077dad8ce3153576e5a816a2526aa6f1cda9eb4b8dc1e97b584e766' 
  AND token = 'MdcO1y/BdUrJpxmVGpPRNWL1p0Z4/UgjRNe0xRGZC4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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