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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0d5420660d1e881677bf3fe616f069f61bf130faf65db9f3582df414258683' 
  AND token = 'ovyMLpp6awWjyZ1mpGx14N+Y5QH89s3gwmsYhkDg3ss=' 
  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"
    }
  }
}