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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4cb0ac13dd96803efb687e4295fb0e1a2b9faa4a26511ed422059b609331cc' 
  AND token = 'f1CAopuSE/C9ZWBDrb+VJAiYv14bqkrs+Z8oBkSw6mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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