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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e59eeb0cf32708aeb2f4c0f880a66a0a999d6126d4f6e59a4c25b37eea245bd' 
  AND token = 'UPFUtmE0mBUFKcFLWJp6x59eycf0+7Cn1h/YxCnQ4II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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