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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0bf7799a5d8d39a92b56a374451afac018828bbd061ab0daef578187e4f8e60' 
  AND token = '9ICIttHQhak4E6RA4N46mJnN3A/TF2snXrkV+1Iw8RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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