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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a8d8e99b19dcfc2999f3afc3175b8b6c3e0511b9e743c30d6eb51feba3251f' 
  AND token = 'j64VJcQ1uPsOBDoMOjJzL12Cs+kV+mJsEL2ErwuHlpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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