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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d86b1055abeb2b289dbec51c266d9e49c11c12e1919775eb00661cf06eef8f' 
  AND token = 'g7sOkMShQo+ulc0fKcMlkbWIM2S0CkVoxkWa30Hu07s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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