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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b7af053255d2c563057a5cdea5b9be796bb8b5be602bb36ffe4a76cad7f00f' 
  AND token = 'kiTMClLYGr+asfYwSlXAnP/OBnA8LRIM8vEUzW5I0PQ=' 
  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"
    }
  }
}