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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54633da8213e9d71dbd18a6355d44c8e597f32fd56b2b972b9e59c4fec9595c7' 
  AND token = 'zvJs9BInHzF6qiozRmUCTA1yJuE8qRpGLDp1396fcyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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