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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a936cd5d974eb95125c88cd79cce58bd5cdd9999fb856136c184d11f090d93' 
  AND token = 'KWZidEXglsbogJiOMf97FE9TWVIjg1nxLx9NHfEYL/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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