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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e006793e8a93f1d9698e7793fb400816719fde639a1a0359a3cb9d8c3c91d673' 
  AND token = '23iDcOnUs3bMb5f5d8+RtasVu3YN/6Py4AnzcZ3VfZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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