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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801db0e4de6c44be0bf9a83224f6835136fa687f6d09115eee11acb6d8b3dec2' 
  AND token = 'EiKfz3cveHI7hyW/m1w7msbTTbIek/FnSTRQir8qBW4=' 
  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"
    }
  }
}