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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c042c76db4d878f2406035b4a7b36c102245a5f95c49f34e9477610b2e0090' 
  AND token = 'p42GvdX4yVxI8Zmzj2KbuwQrT4octGaX5n7NQylpNzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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