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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a135f2bddc9d6f74f7044befa5c8ee37c3f908d5c39b7cb9753ed2a6b407b93' 
  AND token = '2QfLh4hDziS+rlDDOgQkWW3zbhpSOfcscHQLz1D1i6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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