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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662cd705971b6197858b5306f9d430b5f87d56b1222304c566d928b4c21c22a3' 
  AND token = '7QOHoHzxKVU8n+p4B9Bmlnms9WnmZFmEOF99n7QGTos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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