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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d966b1bb1697039d5bb2383c94f831a4bc103804d7b047db71e64046a3167cb' 
  AND token = 'MOG9A1Y0S6p//gjlbLkNMv7iiDygJUTE8refbl/LVA8=' 
  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"
    }
  }
}