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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de7cfe1b4c19ae571776af8da10ea2c91fe32bf5f125f1c23524e15d08e9219' 
  AND token = 'z75tjhbRR5x290LrhpS1raWVm9rgHIgk5N+vH1Vou4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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