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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaafec016d2bf6d7fa6603dd5dce83ba8d8d542a8e3808502bfed75d75fd979c' 
  AND token = 'cRoUBOnUbL7bHKO3PHvPu08fvy+wwsmjMfqdI23MnQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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