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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b300b8f39d88ac28baee5369b6229adedc5150cc18ea305fafb2d2cea0a751e5' 
  AND token = 'kkXBCSQm1MzNvW0OEy1GtAIPNpsS1X/nCmZpmc65zUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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