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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a790dffe98fcb0a42bfe254623da03eac54be6b663ed50d72ff403143489cf1' 
  AND token = '2eLKJ9gWC7L8C4+vD01BTLAjLLpZzE3zKK0SWYJreBo=' 
  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"
    }
  }
}