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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef48848b150921a8816004e7111bf9448399c722a89cc4787e4ebf4385382e1' 
  AND token = '7nP6M3UFec0TsoSCNMT7gdOEald3ZrsZ9yOkdVRyq5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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