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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa219ebea8be38cf4b0dfe1ac2241b046cadaf8dfada73f9e0e8ae818c8d875a' 
  AND token = '0y2fUaiwC1CQaYf+vT8l5eir8Vdmct5lvhriN0AEwNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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