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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d97fa56c793a07a44071a3769ab5028840c2d4b949429838765a9f540dd2421' 
  AND token = 'BAye3CND9bWFtn1ehb3PtbJtayrmMYtJUs9W/o/W9aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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